Diurnal variation in repeated sprint performance cannot be offset when rectal and muscle temperatures are at optimal levels (38.5°C). - Pullinger, Samuel A.; Oksa, Juha; Clark, Liam F.; Guyatt, Joe W.F.; Newlove, Antonia; Burniston, Jatin G.; Doran, Dominic A.; Waterhouse, James M.; Edwards, Ben J. (Chronobiology International: The Journal of Biological & Medical Rhythm Research, 2018)